It's Alive in the Lab blog:
"The current build of the free technology preview of Daylighting Analysis for Revit expired today. [The] period will be extended to 2/28. Stay tuned for a new download in the next few days.
"The Revit 2014 Daylighting Analysis (RDA) plug-in uses the Autodesk 360 Rendering cloud service to perform very fast and physically accurate daylighting analyses from within Revit. The RDA plug-in was specifically designed for architects to be able to use without learning the difference between the Perez or CIE’s sky models, direct normal incident, or direct horizontal radiation. The current technology preview has expired but we plan on posting an update in the next few days. When the update is posted you will find it announced on this blog as well as the Daylighting Analysis for Revit Autodesk Labs page."